Pop-up messages

I've noticed a few sites recently that when you hover over a grahic or a
link a little pop-up box appears with an explatory text in it and was
wondering how this is done. I know that this is similar to much of the
recent discussion on mouse rollovers. However the difference here is that
the pop-up box appears to be above and to the side of the object or words
of the mouseover whereas the normal one is limited by the size of the
original graphic so that everything else produced by the mouseover is the
same size - ok if you are doing "moving" buttons.

Tia

Les

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